Didier Deschamps' side stumbled through their qualification campaign and only made it to Brazil after defeating Ukraine over two-legs in the play-offs.
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They now require only a point against Ecuador in the Maracana on Wednesday to finish top of Group E, with Sissoko in optimistic mood.
"We've been regularly improving our standard since the second leg against Ukraine,” Sissoko told Fifa.com.
"Since then, we've realised we have the qualities to achieve something great, and that's what we're now showing the world.
"We've played two good matches with lots of goals, good combinations, solid work at the back and great attacking moves.
"We'll try to play the way we have since the start of the tournament and remain united on the pitch. If we can do that, France can go very far."
France last won the competition in 1998, but suffered group-stage exits in both 2002 and 2010.